I have a client with echo on their 9650's. I have changed from .729 to .711 on the CODEC. I have read a lot of posts on this subject, and am wondering if there is any documentation that deals with the logical order for troubleshooting this issue, or recommended changes if there are issues? It appears as if there are multitudes of tweaks and I want to be sure I am making the right ones in the right order. Thanks in advance.